The mummy-to-be chose a navy boat-neck sheath dress from her Fall 2011 collection and towering customized Christian Louboutin heels. The final touch was a topper created by milliner Philip Treacy with intricate details.
Continue reading about Beckham's look below:
The 37-year-old's hair was pulled back in a tight ponytail and makeup was dramatic -- sporting a seriously smoky eye with heavily lined lids.
The fashion icon was joined by her hunky husband David Beckham who chose a dark Ralph Lauren suit with a light gray cravat, and opted to wear his CBE (Commander of the British Empire) for the occasion. A classic top hat completed his dapper ensemble.
Meanwhile, make sure to visit our royal wedding site for full coverage of the event.